JPA clear collection and add new items
hibernate, hibernate-mapping, java, jpa, orm
Solution
Turns out that the actual solution was using a @JoinColumn annotation instead of the mappedBy="" parameter.
Problem
I have a @OneToMany collection (list) that I would like to clear, and add new elements to in the same transaction. Using ``` collection.clear(); collection.add(new EntityB()); ``` Simply adds the new instance, and never removes anything. I have `orphanRemoval = true` for the collection field. ADDED: ``` // Parent entity @OneToMany(mappedBy = "product", orphanRemoval = true) private List<Feature> features = new ArrayList<>(); // Child entity @ManyToOne(cascade = CascadeType.ALL) private Product product; // Clear and add attempt product.getFeatures().clear(); Feature feature = new Feature(product, ls); product.getFeatures().add(feature); ```